AN2829 datasheet(15/32 Pages) STMICROELECTRONICS

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AN2829

Jumper settings

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Jumper settings

It is possible to select different working conditions by using the jumpers:

Note:

Please note that jumpers S1, S12 and S13 are already soldered on the demonstration

board, and it is not necessary to change them. Refer to the schematic to check their proper

connection.

●

External bypass connections for the linear regulator LDO5(V5SW)

●

SMPS frequency selection (FSEL)

Table 3.

Jumper S11 (connect V5SW pin to S11)

Position

LDO5 working conditions

OUT5V

When the main ouput voltage is greater than the bootstrap-switchover

threshold, an internal 3

Ω (max) P-channel MOSFET switch connects the

V5SW pin to the LDO5 pin, shutting down the LDO5 internal linear

regulator. If not used, it must be connected to ground.

SGND

The internal linear regulator LDO5 is always on. In this case LDO5

supplies all gate drivers and the internal circuitry. It can provide an output

peak current of 100mA.

EXT5V

The internal linear regulator LDO5 remains off if an alternative 5 V external

voltage is applied to the EXT5V test-point. An internal 3

Ω (max)

P-channel MOSFET switch connects the V5SW pin to the LDO5 output.

The gate drivers and internal circuitry are supplied by the same 5 V

external voltage applied.

Table 4.

Jumper S3 (connect FSEL pin to S3)

Position

SMPS OUT1

SMPS OUT2

SGND

200 kHz

325 kHz

VREF

290 kHz

425 kHz

LDO5

390 kHz

590 kHz

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